Detections
Analytics

CVE-2019-9821

high

Description

A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers. This results in a potentially exploitable crash. This vulnerability affects Firefox < 67.

References

https://www.mozilla.org/security/advisories/mfsa2019-13/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-19183

https://bugzilla.mozilla.org/show_bug.cgi?id=1539125

Details

Source: Mitre, NVD

Published: 2019-07-23

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 8.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00424